Grinding machine



Nov. 6, 1923. l1,473,520

K. ROSAK GRINDING MACHINE Filed Aug. 2.9. 1921 2 Sheets-Sheet 1 K. ROSAK GRINDING MACHINE Nov. 6, 1923. A 1,473,520

Filed Aug. 29. 1921 2 Sheets-Sheet 2 Patented Nov. 6, 1923.

KARL RosAKi'or SGHNEWWEKZUG GFSETJL- vsurnam MIT Busennmg'rnn Herron@ @ernsten/), A oonron'nrron'or GER- MANY.

@it'mismindem.` g

To ill whom. may cicern.' i

Be it linovvnjtht L'Kj Roslin, a citizen of the; ozehosigvarieh Reeiibiic, regia-ieg zit Berlin, N." VQ .87H Wiillenwebei'etr; 6, 5 in the' Sttte of Germany., yinvented certe-in iisfiil``-lii`d1iroveiiint-in or Routine f6 @Grinding-Mamme; of which the i ellovviiigY is a', Sfecifiationk In grinding `Iriaujl'iiiies in whichVV either 10 the-scheint@ 4sppeftiiig#'the grim-fights@ reciprocatee reltvely t the. Work-fori cenvefggiy uit @maag-e carrying Vthe fwork reciprocite's relatively tov the grinding disc, ie ie roben; to effect, ubmocfiiiy @by rmi, m @aimaient free-d1 situ die@ 'or ofthe Work'infthe itiinsver'se direction; that rsi foggy iii-uit dieediwaifds houier, nieuwe @frime-beef ground' to' the @ofrece thicklisl i AST"ldiirihgtlfy r`process Aof grinding the lgrindi-111gV` dise Ivvears out; the thickness di the vifol lifieI tohe niei'sured diee' niu'st-th he""fuitlieiA advanced hv hd until tlef diilerencefdiie tothe wenn@ ef the -giinfiefgdise, 15's mede up @geenV if;I Seinem-s happens uit@ the aderire Vin'"usjuu'iis' 'tot geen ee in has lto bieleiectl fiend'tividi@v tteii'dant. '1 The vvil ,i then liall t' loef;gfbi-1'ii1d: thin are therefore beomes sgiiessp@ y'llliejlr'iil "bcl b'vef referred to' is oliviztted-'ccodig toi-the: piewst invention by provid-ing; turning or #ruhig-device fpr the gfiinaing dige, gaia grinding dis@ moving, 'diir'i-ng' the longitudinl movement relfitiveffto the Y-vvo'rlg V@niet the sidfturn'ing dev-'ice which SVS in Scl 2iifginnl"v that the I'grir'idiiig diec cornesf into engagement with the ma isfgwupd aus' stoms the 4o grinding' fooi has beenf eayfie or fedv This device `jouldbefso irrnged thtthe setting oftheturning'or truing' tool for the grindii'i' die@A is at the sagme Atine utilized for articleto he mchinedf The setting device for-tlietru'ing tool iSthen provid'ed-vvith a Scale, the zero of which corresponds toa given line of the grinding mchine5 for? in'sitnceincirculzirf'giinding machines to the' Ysiiindle ejxisV and in Yflatgrinding macliineel toy the' Surface of the leedv or table or the like.` The setting' of the turning toolto 'agiven ydimension eueures then 'at the Sne'time'the grinding of the Work to i r i i l xing'th'e erect "dimension of thel Fig: 3

shows. in, vertical section v on an enlarged scale the setting device o'rthe turning or truing tool, x

Fig: 5 is pln of Figure 3, und` Fig. 6 shows the Setting device for the ,tru-ing toolf'or flat' grinding. machines.y

1%5 a crriage Z1 isVv mounted onv` guides `on vthe bed a" of the mlchine sojthati/it is adjustable inthe longitudinal direction of the machine.- v'1 -he carriage. Za is provided with a; sliding bracket carrying the glld ing disc el'. Moreover onthe "bed, off the Figml is it detail hereinfter referredtof 75 i In theV arrangement shoWnQin Figures machine is mounted :i slide, rest''e which ,Y

cf'zirriehsp;the devices for xingthe'work.- .-In thevv construction illustrated, said devices comprise a'heaidstock fgthespindleof;which carriles fa. driving pulley` g und, movable headstock luv/.ith the back centrer-Z. BetweenV the tw headstocksis fixed in Well linowii' manner. the Work 7; which is tothe ground. The? grinding disc fis mounted;

on a spindle which carries a driving pulley k.' The pulleys g and 7c are. driven n the usual manner, for insta-nce fromV an overhead countershaft. .i

ccordingto the invention, on the slide rest e''is mounted a diamond m, or other device for vturning vortruing, grindingl discs, in such `manner that duringfthe movement of the grinding dise relatively to' the Work, theV grinding disopasses in front or"l ,the diamond. vIn the construction illustrated,

the truing dimond m; is mounted for instanceZ in el' bracket o which is. securedto the movable headstck 7i or, asshovvn in Figure 3-,fdir`ect to the Apleitte e; yThe 'diamond-'m which could'be of coursereplaced by ny other turning tool must' be adjustabley to- Wards the grinding diend; To that. end,` the Vdiniond holder fm1 is secured in 'zi|` sliding block p substantially cylindrical in shape but provided with an upward projection Q. The said block slides in a. bore in the bracket 0, and the upward projection g moves in a corresponding slot in said bracket whichY elongated hole s in the back centre Z in order to enable the latter to be moved longitudinally for the purpose of loosening the work without it being necessary to withdraw the diamond holder. flChe bracket o has an upward projection 25 in `which is mounted a sleeve u which is secured in posit-ion by means oa nut '0. rlhe sleeve u is provided internally7 wit-h a screw thread with which engages a spindle w.' Y One end or' this spindle is mounted in the .projection Q whilst the opposite end is screwed into a sleeve y which engages the sleeve u and is held tast therein by means of alocknut s. On the outside, the sleeve 1/ carriesa ring 2 which can rotate on said sleeve and .be locked in any desired position bymeans of a set screw 3. The said ring is provided with a flange-like projec-v tion 4L which, as shown in Figures 3 and 5, isl

provided with a scale division on its periphery. To the projection t is secured by means of screws 6 a scale 5 as shown'more particularly in. Figure 5.

In this setting device shown in Figures 3,-5 the diamond holder m1 is always pulled f by the spring 1 away from the grinding disc d and the projection g engages the spindle to, If 'the diamond m is to be moved towards the grinding disc, the spindle L0 is turned by means of the sleeve y. The scales l andV 5 indicate then the extent to .which the diamond Yis advanced, namely the scale 5 in millimeters and the scale ,in'the event ot. the same having a hundred divisions on the circumference, in hundredths of a millimeter. V

The device is preferably so arranged that the scales indicate Zero when the diamond point coincides exactly with the axis o'tlie-V untilthe work has a radius of 15 nim. li

the grinding is continued, the grinding disc d will be turned in passing in front of the diamond m.

It is important thatthe bracket 0 and the setting device mounted on thev same, should always retain their position and not be dis- Yinantled again, so as to avoid any inaccuracies. ln order, however, to be able to remove the block p with the diamond holder m1 from the machine, the bore through which said block passes is adjoined at the bottom by a recess 2-1 (Figure e) the shape of which corresponds to that oi the projecn tion g. To remove the block jftlie latter is pressed7 in oppositionl to'the action of the springw, towards the grinding disc d until the projection g' is introntof the bracket 0, whereupon'the block is turned through an angle of 180O se that it passes through the recess 24 and the whole block 20` can be withdrawn. i

A similar arrangement'can be used in flat grinding machines, as shown in Figure 6. 'In the said ligure, 7 is a part of the bed of the grinding machine on which theV grinding table or carriage 8 is reciprocated at vright angles to the plane ofthe drawing by means ot thetriangular guide 9. 10 is .the grinding. disc which rotates about a vertical axis and 11 the work to be ground restingon Y the table 8 towhich is secured a casing i2 for the diamond holder 18. holder has an internal screwthread ltwith which engages a spindle l5, prevented from moving in the axial direction by means of a collar lwith a lnut 17 inserted intof the `casing 12. To the spindle 15 beyond the nut 17 is secured, for instance by means ot keys 19 or the like a ring 18 so that by rotating'said ring the spindle 15 will bej likewise rotated and the diamond holder 13 will be moved The diamond ico axially. On the ring 18 is mounted a ring 2O provided with ay scale and adapted; to be locked by means of a set screwv21. rlie setting or adjustment of the said ring can be read by means of. a pointer22 or by an index on the surface of the casing 12. .The millimeter scale 23 is provided on the vdiamond holderitselt. V"llhe scales are again so arranged that in thezero position thereof the diamond point is situated exactly in the plane of the table 8. It a piece of work ,11 of a given heightV is to be ground, itis merely necessary to set Von the scales the height in question, as indicated by dotted lines in Figure 6 without any subsequent measuring being required.

ln both cases, that is to say in Figures 3-5 as well as in Figure-6, the scale ring 2 or 20 is adjustably mounted. This is done because the grinding discs.r according to the ineness oi their grain and to their hardness, grind'to 'a dierent degree for .the Vsaine Iarl- 'l justinent. It may therefore happen that when soft grinding discs are used, the .device Y works correctly whereas when hard discs with the measurement indicator on the scale. In order to enable this'diiference-which it is true amounts to so small fractions of a millimeter-to be compensated, the above mentioned adjustability yof the scale rings is provided. lVhen a different grinding disc is to be used, the set screw 3' or 21 is loosened and the scale is adjusted in accordance with a ground and measured article.

The working of the 'device is therefore such that after the fixing of the work the diamond, or other tool used for 'truing the grinding disc, is so set by means of the scales that the scales indicate the desired eX- tent of grinding. The machine is V,then thrown into gear, the carriagev Z) in the construction shown in Figures lf with the grinding disc d being then reciprocated in front of the work e'. In the construction according to Figure 6, the grinding disc 10 has no movement of translation, that is to say, it merely rotates, whilst the slide 8 with the work 11 and the diamond fm is moved in front of the grinding disc. The travel in both cases is calculated so that the grinding disc passes in front of the diamond mi. During the reciprocation, the slide is fed forwardvby hand or by an automatic feed de-V vice, diagrammatically indicated at n in Figures l and 2, so that the work is gradually ground thinner. When the correctthickness of the work has been reached the grinding disc comes within reach of the turning diamond and if a further advance or feeding of the disc is effected, the grinding disc in passing will be turned down by said diamond to the same extent as that Vof the advance, so that no further removal of material from the work is possiblef The work will be therefore ground to the exact thickness required evenwhen the disc is worn out. It is merely necessary tostop the ma chine as soon as the attendant notices that the grinding disc is being turned by the diamond. This movement is clearly noticeable owing to the intense sparking and to the peculiar noise.

It is of course necessary to see that the advance of the grinding tool slide always takes place when the grinding disc is behind.

the diamond, so that after the advance it comes into engagement first with the diamond, and only then with the work.

An automatic disengaging or throwin out of gear device could be provided whicl would become operative only when the` grinding disc is actually in engagement with the diamond. Y The existing automatic throwing out of gear or disengaging devices would therefore have to be moved a few feet further back compared to the position in which they are usually set, in order that the feed may continue until the grinding disc comes into engagement with the diamond.

The construction illustrated in Figures 1-5 shows the device on a circular ,grinding machine with one grind-ing disc yand one piece of work. It could be ofcourse equally well applied to grinding machines ment device could be used for the diamond;

or other turning tools. v

ln those cases in which a'.A large amount of material has to be removed Aand in which consequently'the grinding ofthe work takes a long time, it is advisable, in *order toeconomize time, that during the preliminary grinding the travel of the grinding. disc and work towards each other should be made as short as possible. The grinding disc has then merely to pass in front of the workitself, without Vcoming within reach of the turning or tr'uingtool. It will be sufiicient to set the stroke or travel of the slide so that the grinding discv passes in front of the truing tool, only after the work has been ground practically to itsA finished dimension.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to Vbe performed, I declare that what I claim is:

1. In a grinding machine, the combination with a rotary grinding1 disc, and a holder for a work piece to be machined, one of said elements having a reciprocatory movement relative tothe other, of means for effecting a relative feed movement between the Work holder andthe disc; a` truing device for the grinding disc in front of which said disc passes during the normal relative reciprocaf tory movement between the disc and work holder; and aV setting device ,for adjusting the position of the truing device so that the grinding disc automatically comes into contact therewith and is turned down or cut thereby when said disc is fed-beyond the desired dimension of the work piece, wher-eby the grinding disc lis prevented from continuing its grinding action on the Work piece; said setting device being provided with scales settable to indicate the nished dimension of the work piece corresponding to each particular adjustment of the truing device. j

, 2. In a grinding machine, the combination, with a rotary grinding disc, and a holder for a work piece to be machined, one of said elements having a reciprocatory movement relative to the other, of means for effecting a relative feed movement between the workk holder and the disc; a truing device for the grinding discV in front of which said disc passes during the normal relative reciprocatory movement between the disc and work holder; a setting device for adjusting the position of the truing device so that the ico grinding disc automatically comes into contact therewith and is turned down or cut thereby when said disc is fed beyond the desired dimension of the work piece, whereby the grinding disc is prevented from continuing its grinding action on the work piece; and a ring provided with a scale and adjustably mounted on the setting device to regulate its position.

3. ln a grinding' machine, the combination, with a rotary grinding disc, and a holder for a work piece lto be machined, one of said elements having a reciprocatory movement relative to the other, of means Yfor eiecting a relative feed movement between the work holder and the disc; a truingrdevice for the grinding disc in front of which said disc passes during the normal relative reciprocatory movement between the disc and Work holder; a setting device for adjusting the position of the truing device so that the grinding disc automatically comes into contact therewith and is turned down or cut thereby when saiddisc is fed beyond the desired dimension of the work piece, wherebythe grinding disc is prevented from continuing its grinding action on the work piece; and a guide bracket for the truing device to permit the latter to be withdrawn towards the back from the bracket, without removing the setting device, after said truing device has been turned about its axis through a suitable angle.

In testimony whereof l have affixed my signature.

KARL ROSAK. 

